Chademo Getting a Boost Mode

[danrjones]

Even 73-74 feels a good step faster than the 44 you usually get from the older Chademos.

Guess we need the new EVGo stations up to see if the Leaf can do better.

Doesn't EA bump their $ rate up at 75 KW, so if you touch 75 for even a few seconds, you bump into the next cost tier?

So ideally you want to stay at 74 or bellow. It would suck to get charged the higher rate for charging briefly at 76 KW

Speaking of which. One of the folks on Facebook reported 76 Kw (and an apparent screen shot) on a new 2019 Eplus at one of the new BC hydro Chademo s. I don’t think they are charging for it yet as they usually don’t charge for the first 6 months in operation. Debugging?

It sure would be nice if Nissan gave you a way to set a charge rate limit, such as 70 KW max, along with the missing charge % limit. Seems like turning off the charging at a certain % would be easy, since they can turn it off with a timer. Not sure about limiting Fast Charge though to a certain KW?

[DougWantsALeaf]

I don’t think Chademo ever goes to the next cost level, as it’s stated as 50.

At the faster EA station I was still above 60 at 50% SOC.

[danrjones]

I don’t think Chademo ever goes to the next cost level, as it’s stated as 50.

At the faster EA station I was still above 60 at 50% SOC.

What was the sticker (50kW, etc) on the faster station?

What was your battery temps?

[SageBrush]

The Nissan Leaf + is supposed to take 100kW. Otherwise why would their website say:
45 MINUTES
62 kWh BATTERY 80% CHARGE: [*]
100 kWh DC QUICK CHARGE (clearly they meant kW here )

Even that example doesn't equate to 100 KW. You are getting what? Maybe 45 kwh in 45 mins. That is 60 kw. Figure in the inevitable ramp down and its still nowhere near 100 kw.

kW is the rate of charge which can reach 100kW for the Nissan Leaf + at peak. I am not suggesting that the car will charge at 100kW or average 100kW for the duration of the charging session.

The max charge rate we have seen for our car is 74kW at an Electrify America station. The sticker on it stated 50kW but peak was higher than this and averaged higher for 15 minute charge session.

200 Amp max. I leave the rest of the arithmetic to you

[NotATesla]

Even that example doesn't equate to 100 KW. You are getting what? Maybe 45 kwh in 45 mins. That is 60 kw. Figure in the inevitable ramp down and its still nowhere near 100 kw.

kW is the rate of charge which can reach 100kW for the Nissan Leaf + at peak. I am not suggesting that the car will charge at 100kW or average 100kW for the duration of the charging session.

The max charge rate we have seen for our car is 74kW at an Electrify America station. The sticker on it stated 50kW but peak was higher than this and averaged higher for 15 minute charge session.

200 Amp max. I leave the rest of the arithmetic to you

What is setting the 200 amp max? Chademo 2.0 supports 400 amp.

Trying to understand why 100kW peak isn't possible?

[SageBrush]

kW is the rate of charge which can reach 100kW for the Nissan Leaf + at peak. I am not suggesting that the car will charge at 100kW or average 100kW for the duration of the charging session.

The max charge rate we have seen for our car is 74kW at an Electrify America station. The sticker on it stated 50kW but peak was higher than this and averaged higher for 15 minute charge session.

200 Amp max. I leave the rest of the arithmetic to you

What is setting the 200 amp max? Chademo 2.0 supports 400 amp.

Trying to understand why 100kW peak isn't possible?

Charging power is always the lesser of:

1. Charger maximum of amperage and voltage. For EA, I think it is 500 Amps and 700 volts (not sure)
2. Protocol maximum
3. Cable maximum. At EA, 200 Amps for CHAdeMO, I think 400 Amps for the CCS cable. EA currently derates CHAdeMO to 100 Amps pending resolution of problems at higher rates.
4. Car electronics maximum. New LEAF, 200 Amps. Old LEAF, 125 Amps
5. Car Amperage maximum by cell voltage. Amperage tapers down after ~ 3.75 volts

[NotATesla]

200 Amp max. I leave the rest of the arithmetic to you

What is setting the 200 amp max? Chademo 2.0 supports 400 amp.

Trying to understand why 100kW peak isn't possible?

Charging power is always the lesser of:

1. Charger maximum of amperage and voltage. For EA, I think it is 500 Amps and 700 volts (not sure)
2. Protocol maximum
3. Cable maximum. At EA, 200 Amps for CHAdeMO, I think 400 Amps for the CCS cable. EA currently derates CHAdeMO to 100 Amps pending resolution of problems at higher rates.
4. Car electronics maximum. New LEAF, 200 Amps. Old LEAF, 125 Amps
5. Car Amperage maximum by cell voltage. Amperage tapers down after ~ 3.75 volts

All of this I understand. For #3 that doesn't mean charging above 200 amps isn't possible, it just means you can't do it at the provided EA chargers.

What I didn't know is #4, where did you learn this information? I haven't seen a limit of 200 amps for the leaf posted anywhere.

[DaveinOlyWA]

Even 73-74 feels a good step faster than the 44 you usually get from the older Chademos.

Guess we need the new EVGo stations up to see if the Leaf can do better.

Doesn't EA bump their $ rate up at 75 KW, so if you touch 75 for even a few seconds, you bump into the next cost tier?

So ideally you want to stay at 74 or bellow. It would suck to get charged the higher rate for charging briefly at 76 KW

The rate is based on the station you plug into. 50 KW will never charge the higher rate no matter how fast you charge. Conversely, you plug into a 150 KW station with a 100 KW car that whose SOC is past the knee and you never get more than 40 kw, you will still be charged the higher rate.

[SageBrush]

Conversely, you plug into a 150 KW station with a 100 KW car that whose SOC is past the knee and you never get more than 40 kw, you will still be charged the higher rate.

Are you sure, as in proven by experience ?

[danrjones]

Even 73-74 feels a good step faster than the 44 you usually get from the older Chademos.

Guess we need the new EVGo stations up to see if the Leaf can do better.

Doesn't EA bump their $ rate up at 75 KW, so if you touch 75 for even a few seconds, you bump into the next cost tier?

So ideally you want to stay at 74 or bellow. It would suck to get charged the higher rate for charging briefly at 76 KW

The rate is based on the station you plug into. 50 KW will never charge the higher rate no matter how fast you charge. Conversely, you plug into a 150 KW station with a 100 KW car that whose SOC is past the knee and you never get more than 40 kw, you will still be charged the higher rate.

So if you plugged a 50 kW CCS into one of the 150 or even 350 kW plugs, and never drew more than a peak of 50 kW, you get charged at a higher rate? That's not what I expected.

On their website they say "Our DC fast charging stations have a range of 50kW, 150kW, and 350kW chargers. These kW values refer to the maximum power each charger can provide"

For CA, their rate plans are listed at 75 or less, 125 or less and 350 or less.

So to hit 75, wouldn't you "theoretically" have to use the 150kW charger?

Sorry, something just doesn't make sense.